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Spinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not onl...

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

Sapphires are precious gemstones, but unlike rubies, they come in a rainbow of colors besides red!  They are all varieties of the mineral corundum,...